Locking mechanism for mob and burglar proof doors



Patented July 21, 1896.

0. J. MERRITT. LOOKING MBOHANISM FOR MOB AND BUROLAR PROOF DOORS.

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NO Model.)

UNITED STATES PATENT OFFICE.

OTIS J. MERRITT, OF SENEAGUOTEEN, IDAHO, ASSIGNORY OF ONE-HALF TO JOHNJ. COSTELLO, OF COEUR DALENE, IDAHO.

LOCKING MECHANISM FOR MOB AND BURGLAR PROOF DOORS.

SPECIFICATION forming part 0f Letters Patent N0. 564,388, dated July 21,1896.

application iled December 28, 1895. Serial No. 573,655. '(No model.)

To @ZZ whom, it may concern.'

Be it known that I, OTIs J. MERRITT, a citizen of the United States,residing at Seneaguoteen, in the county of Kootenai and State of Idaho,have invented certain new and useful Improvements in Locking Mechanismfor Mob and Burglar Proof Doors, of which the following is adescription, reference being had to the accompanying drawings, and tothe letters and figures of reference marked thereon.

My invention relates to improvements in locking mechanism for mob andburglar proof doors.

The object of my invention is to provide a strong door which may be usedwhenever iire and burglar proof qualities are desirable, as, forexample, in vaults, grain-elevators, prisons, and some residences. Thedetails of the invention will be hereinafter set forth.

In the drawings, Figure l is a view showing the door in front elevationand indicating also in dotted lines the interior mechanism. Fig. 2 is aview in elevation showing the door with its bolt-work exposed. Fig. 3 isa section on the line 3 3 of Fig. 1. Fig. tis a sectional detail on theline 44 of Fig. 1. is a sectional detail on the line 5 5 of Fig. l. Fig.6 is a perspective view, partly in full and partly in dotted lines,showing one of the door-bolts and the means for actuating it.

My improved door comprises a front plate A and a back plate B, whichshould be of any desired material, usually of hardened metal, althoughwood covered with metal may be used.

The bolt-work of the door is housed between the front and rear plates AB, where it is most efciently protected from heat or violence. Thebolt-actuating mechanism extends through the front plate into convenientposition for locking and unlocking.

My improved door is provided with a number of parallel pairs ofhorizontal bolts, in the present instance three pairs or sets, O O, D D,E E, being shown. A central bar F is arranged to be moved vertically,the bolts being at right angles thereto and on both sides thereof. Thebar G is formed with angular inclined or V-shaped slots f f, preferablyformed with parallel portions at their diver- Fig. 5

gent ends, and each bolt is provided with an actuating-pin G. The pins Gextend at right angles from the bolt and into the slots f, and the boltsO D E are suitably iiattened in their portion adjacent to the pins G, soas to permit of their sliding under the bar F. The bolts are held inhorizontal position, so as to permit of longitudinal movement. When thebar F is moved up or down, the pins G are forced to slide in the groovesf, which by their converging form draw in or push out the bolts O D E,according as the bar F is moved up or down.

As indicated in dotted lines in Fig. l and in section in Fig. 3, ahousing or casing l-I is fitted over the bar F, either along its entirelength, as indicated, or along portions thereof, the said casing H beingsuitably attached to the rear door-plate B. Similar casings I are fittedover each one of the bolts O C D D E E, movably sustaining them in theirrespective Vertical and horizontal positions.

It will be understood that any desired number of sets of bolts C C, D D,F. E may be employed, two additional sets of slots f being indicated indotted lines in Fig. 2.

The front and rear plates A B are separable to permit access to thebolt-work, and they are conveniently united by bolts J, said boltspassing through intertting extensions j j', Fig. 5, the parts of whichare integral with or secured to the front and rear plates of the door,respectively.

Hinges K are secured to the rear plate of the door in any desirablemanner, and the front plate A is provided with a knob L.

rlhe vertically-moving bar F is provided with a rack M. A wheel misprovided with a sufficient number of teeth to engage the teeth of therack, and is held in position thereon by a casing N, which contains thewheel and ts over and incloses the rack M, being secured in positionupon or formed as a part of the casing H, which is suitably apertured topermit the wheel m to engage the rack M. The

wheel my is provided with a central opening, which is squared to receivethe correspondingly-squared end portion of an operatinglever O. Thecasing N is suitably apertured to permit the insertion of the squaredend of the operating-lever, and for locking the bar F in its raised orlowered position, and thereby locking the bolt-Work, the Wheel m isprovided with additional notches. An opening n is provided in the easingN, said opening registering with notches in the Wheel m when in thedesired position for locking, Whether the bolts be in or out, and a pinP is provided, which is adapted to pass through the opening in thecasing N to enter one or other of the lockingnotches to hold the partsin the desired positions.

A suitable door-frame Q is properly supported in the Wall and providedwith openings to receive the ends of the lockingbolts C C D D E E.

Various modifications in the structure herein described maybe made inView of the foregoing without departing from the invention. l

Having described my invention', What I claim is- Incombination, a doorcomprising front and back pla-tes separably united, a series oi'horizontal movable locking-bolts, each bolt provided with a pinextending at right angles through itsinner end, a vertically-1n ovingbar formed with angular or V-shaped slots engaging the pins of thelocking-bolts and adapted when said bar is raised or lowered to push outor draw in all the bolts simultaneously, a casing secured to the backplate of the door between said front and back plates and inclosing thebar and securing it in operative position, and similar casings appliedto each of the bolts for securing them in the described position Withrespect to the vertically-1noving bar, and means for imparting Verticalmotion to the said bar to lock and unlock the door, said meanscomprising a rack secured to the bar, a pinion engaging the rack, acasing inclosing the rack and pinion and sustaining the pinion inoperative relation to the rack, said casing extending partly through thefront plate of the door, and an adjust( ble lever for actuating thepinion and through it the locking mechanism.

ln testimony whereof I hereto alix in vsign nature in presence of twoWitnesses.

OTIS J. MERRIT' i. \Vituesses:

F. E. EMPEY, JAMES Il. MARTE.

